Unless you want to invest heavily in FF, with the current state of m4/3, there is no need for a second system. Maintaining two systems is the most costly solution anyway. People should rather sell their older equipment if they want to switch to or quit m4/3. Very often with many users only one system is used mostly while the other catches dust. And I bet the dust catching system is the larger and heavier one in most cases.

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Thomas

Its only costly if you buy new. You can pick up a Canon 5D classic for $450 and add a 35mm f/2 for $250mm and a 85mm f/1.8 for $350.